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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Marston PWS

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

MORE ABOUT THIS CONTAMINANT

 

32

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND20ND
2015ND30ND
20160.181 ppb82ND - 0.940 ppb
20170.113 ppb91ND - 1.02 ppb
2018ND50ND
20190.352 ppb52ND - 0.880 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-08-06AC30849ND
2014-08-06AC30848ND
2015-07-29AC54442ND
2015-08-18AC58246ND
2015-10-19AC62479ND
2016-02-01AC65720ND
2016-04-27AC70012ND
2016-04-27AC700110.510 ppb
2016-07-20AC797950.940 ppb
2016-08-01AC80712ND
2016-08-01AC80711ND
2016-10-26AC85957ND
2016-10-26AC85956ND
2017-01-22AC89836ND
2017-01-22AC89835ND
2017-05-01AC95081ND
2017-05-01AC95082ND
2017-07-17AD02387ND
2017-07-17AD02386ND
2017-07-31AD044181.02 ppb
2017-10-23AD08587ND
2017-10-23AD08588ND
2018-03-06AD17523ND
2018-05-02AD18671ND
2018-07-11AD29590ND
2018-07-25AD29289ND
2018-10-11AD35068ND
2019-01-08AD38381ND
2019-04-10AD466720.880 ppb
2019-07-11AD52717ND
2019-08-14AD51907ND
2019-10-17AD573790.880 ppb